Printable Hard Sudoku

Set 1bv4iqo. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
9 8
1 9
3 8 9 6
7 3
2 8 3 4 5
3 4 6
1 5 8 4 7
2 3 9
7 6 5
Hard #2
5 7 2
6 2 1 4 8
9 4
1 4 7
3 9
8 9 5 2
5 1 9 4
3 8
6 8 3 7
Hard #3
1 5 8 7
8 4 7 6 3
5 4 8 9 6
6 8
4 9
3 1 2
8 9 3
2 5 9
7 5
Hard #4
1 2 7 4
5 8 7 6
7 9 2 5
5 4 8
5 2 6 3
8 3 2 4
2 8
9 1 7
6
Hard #5
4
6 1 4
7 3 1 6 2
7 3 2
8 3 2 9
9 8 1 5
9 5 3
1 4 7 2
3 6
Hard #6
5 7
3 9 4
1 4 9 8 3 6
3 1 6
6 8
7 4 8 9 5
5 1
6 2 7
8 7 6
Hard #7
5 9 1 7 2
1 3
8 4
9 8 7 6 3
5 6 2 8
2 3 8 7
6 4 1
8 9
3 5
Hard #8
9 4 7
4 6 7 1
8 7 3 9
9 3 4
8 5 9
8 1 7
7 6 4 2
7 5
5 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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